Had it been a repair / replacement the permit would still need to be pulled, but it would likely have no significant impact on your taxes.Adding bathrooms, bedrooms, etc. impacts the value of the property (usually value goes up by adding these things), and towns know that, so they want to make sure they are taxing you at the appropriate value.

., depending on your lifestyle, 65% income replacement is generally low.  

If the owner does not, then just buy a spare of each size and replace them as needed.If you are having one that goes out all the time, you may have an electrical problem, and FOR YOUR OWN SAFETY tell the owner about it NOW (so you don't burn to death in an electrical fire).Good Luck! 

Then are they going to charge you another placement fee for the replacement tenant.  

Do they flag stuff like a furnace or water heater that was replaced and didn't pull permit or are they usually pretty relax unless theres a tenant complaint?

Roof looked like it needed to be replaced soon though.

Replaced the roof.

In this flip, we replaced the roof and electrical panel.

A few of them being that the furnace would need to be replaced and there was mold in the furnace and exterior utility closet.

Roof was replaced a year prior to our purchase so no need to replace.